Steam boiler



Nov. l0, l925- 1,560,801

' D. s. JACOBUS STEAM BOILER Filed Sept. 19, 1919 VEN TOR.

BY www ATTORNEYS.

Patented Nov. 10, 1925.

UNITI-:o STATES l1.fait 801 PATENT oFFic'lv-;

DAVID s. JAcoBUs, or JERSEY orrY, NEW-JERSEY, AssIeNoR 'ro THE BABoo'ox e WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION F NEW JERSEY.

STEAM BOILER.

Application led September To all whom t may concern:

Be it known that I, DAVID S. JACOBUS, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey,'have invented certain new and useful Improvements in ASteam Boilers, or which the following is a specification.

My invention relates to a steam boiler, and more particularly gto a steam boiler of the water tube type.

Water tube boilers of the type known in the art as' the drop-leg construction-i. e., a construction comprising two banksof water tubes spaced apart to form a secondary combustion chamber between the two bankshave 'heretofore Ibeen built. Difficulty, however, has been experienced with boilers of this type because of the tendency for slag to collect on the tubes of the lower bank and thus obstruct the draft passages'.

Invaccordanace with my present invention,

this diiculty has been overcome, or largely reduced,v by the provision of means for increasing the flow area through the iirst bank of tubes to the secondary combustion cham-vv ber. f

My inventionwil'l best vbe' understood` by reference to the accompanying drawing, in which` the single figure of the-drawing is a 3o .longitudinal section, partly in side elevation,

of a steam'boiler embodying my invention. Referring nowvto the drawing, 1 is the front wall'and 2 'therea'r Wall of a furnace, the upper portion of the combustion charn- 35 ber of which is -indicated at 3.1 The water tubes of a steam boiler are located above the combustion chamber and are divided into two groups, the tubes of the upper group of which are connected at one end to down- 40 take headers 5El and at the other end to uptake headers 6a. which is here' illustrated as consisting of two rows, v is indicated by the reference numeral 7, and the .ends of these'tubes are connected to the headers 5"L and 6., respectively. The lower bankmof tubes 7, is spaced from the upper bank .to` form an unobstructedy secondary combustion chamber 12, which is of-suicient proportions to -allow an i 5o" operator' to enter the' chamber when the boiler is shutdown for cleaning to remove any slag from the tubes which may not have 'been reached by the tools passed through the access doors, repair the baiiies, and perform any other desired 'work on parts accessible tool, the deposit is removed.

' IDEI'.

The lower bank of, tubes,

19, 1919. serial ne. 324,817.

in the furnace wall beneath the uppermost ends or the tubes/7a. The sla is removed from the tubes 7 a without shuttln'gdown the boiler by means of special tools or rods prei'- erably provided with bent ends, which are passed through the access openings 136 and betweenv the tubes of the lower bank, andv by turning the tool, the bent end is `brought against the tubes, and by reci rocating the y employing the right sort ofpspecial tools, practically all of the surface of the tubes 7 where the gases pass between them on enterino" the iirst pass can be reached Iandtheexterior of the tubes thereby kept clean. The downtake headers 5 are connectedto a steam and 'water ,drum "13 by' pipes onnipples 14,.

tubes 16 and 17, the two arms of the latterl tubes being closer together than those of the former and being disposed within the for- The ends of the U-tubes 16 are connected to boxes 18 andlf), while t-he ends of the tubes 17 are f' connected to boxes 2O and 21.

-through the 'first bank of tubes to the secondary combustion chamber.

The bathe construction B co1np1ises two from `'said space, the portions of the. tube's eov parts, the first part being formed Kof a'bale l 31 disposed above the upper rowof water tubes of the lower bank and extending par- 4 allel thereto, and the second part ofthe baiejconstruction comprising a balile32'in clined to thevertica-l 4forwardly fromthe front end of the baille 31 and 'extending v across 4the secondary combustion chamber and the upper bank oi water tubes to the heater A. The gases flow from the secondary combustion chamber through the first.

pass, then over the tubes of the superhe'ater,

downwardly through the seco-nd pass and upwardly to the third pass, as indicated by the arrows.

In accordance with my invention, the tubes of the lower bank are entirely exposed to the gases and their surfaces are largely exposed to Athe-radiant heat of the furnace, with the consequence that the furnace temperature is lowered, which results in a lesser amount of slag adhering to the tubes,

The space which comes directly above the tubes of the lower bank serves a useful purpose in causing the gases to mingle after they 'flow over the tubes ofthe drop-leg and before ,they enter the spaces between the tubes of the main bank at the bottom of the. first pass. Some of the particles of slag will be carried along with the gases in a molten state at the middle part of the spaces between the tubes' of the lower bank, whereas the gases which contact with the tubes of the lower bank will be cooled to a point that/will'cause some of the slag to solidify. vBy causing the gases to mingle in the space above the tubes of the lower bank before they strike the lowerinost tubes of the first pass over the main bank of tubes, the particles of slag will be cooled as a whole and lesstrouble vwill result through the' adhesion of' the slag to the'tubes of the main bank than would occur should the tubes of the lower bank be brought in close proximity to the tubes of the' main bank.

It will be apparent that, in accordance with my invention, thev flow area through the first bank of tubes is greater 'than that through theirst. pass of the upper` bank, with the' consequence that the diiiiculty aris-l ing from the accumulation of slag on the lower bank of tubes has been greatly decreased, and the provision ofa construction which enables an operator to enter the secr ondary combustionichamber and remove any slag that may have formed, further serves to keep the tubes substantially free from deposit. v my inventioi'nrthe tubes ,of thel lowerbank,

hbeneath the combustion chamber, are enfrom the furnace, with the consequence that.-

tirely exposed to the gases and their surf faces are largely exposed to the radiant heat thefurnace temperature is.- lowered'to a point where the brickwork will have a longe-r lifev before it is necessary to replace it than itfwould have in a hotter furnace. This, combi-ned with reducing theob'struction to tl-iefow of the gases on entering' the.

spaces between the tubes, results' in a l`setting that exceptionally well fitted lfor the high capacity and high economy under Furthermore, in accordancel with) i which boilers must now be operated in certain lines of service.

Inclining the ba-iiie 32 which comes between the first and second passes forwardly, also assists in minimizing difliculties through the dust which collects on the outsideof the tubes, this dust being in the main from slag which is coooled to a point by passing' between the lowermost .tubes that will pre` vent it from adhering in a fused state. lVith a vertical batlie between the first and second passes, the dust will collect in solid masses against the baffle at the point where there is still enough heat to allow fused particles to strike the mass and cement it together, and will build out toward the uptake headers. By inclining the baille as shown, the tendency for the dust to collect against the baile is reduced and there is a lesser amount of trouble through this action. The arrangement, therefore, provides y for a minimum obstruction of the flow of the gases through the boiler in cases where sont and slag is present in the gases. 4

l/Vhat 'I claim and desire to secure by Letters Patent of the United States is:

1. A boiler of the water tube type, comprising a bank of horizontally inclined tubes connected at their ends to water compartments, a steam and water drum above the bank connected tothe end compartments, a lower group of tubes comprising a plurality of rows spaced apart from the main bank to give a chamber therebetween, the lower group of tubes being exposed to the furnace chamber beneath forsubstantially their entire length, a horizontally inclined roof battle extending from the lower ends of the tubes above the lower group for a portion of the length of the tubes, a transverse baffle extending from the inner portion of said roof baile forwardly and upwardly at an inclination to the vertical across the tubes of the main bank, the boiler having a down pass at the opposite side of said forwardly inclined transverse baflie.

21h a steam boiler of the water tube type, two banks of horizontally inclined water tubes spaced apart to form a chamber y therebetween of a height equal to a plurality of the rows of tubes, a lowerv furnace underlying' substantially the entire length of the tubes-the vlowery tubes being exposed to the furnace for substantially their entire length,

up through the gradually narrowing upward ass.

p 3. In a steam boiler of the water tube type, two banks of horizontally inclined water tubes spaced apart toform a chamber therebetween of a height equal to a plurality of the rows of tubes, a lower furnace underlying substant-ially the entire length of the tubes, the lower tubes being exposed to the furnace for substantially their entire length, end water compartments to which the water tubes are connected, an upper drum to which the water compartments are connected, a baille comprising a roof baille extending from the lower end of the water tubes intermediate thereof for a portion of their length above the lowermost tubes and having a cross baille extending upwardly and forwardly from its inner portion at an angle to the vertical, said baffle being arranged to give a down pass to the gases after flowing up through the gradually narrowing pass, the iirst up pass over the water tubes being at least as large in average area as the second or down pass.

4. A boiler of the water tube type, comprising a bank of horizontally inclined tubes connected at their ends to water compartments, a steam and water drum above the bank connected to the Aend compartments, a lower group of inclined tubes containing a plurality ofl rows spaced apart from the main bank to form a chamber therebetween' at their' upper end portions of a -height ,equal to a plurality of rows of tubes, a furnace having a combustion chamber extend-` ing substa-ntially the entire length of the lower exposed rows of tubes, said furnace being of a type which causes slag particles to rise toward the water tubes, aihorizontally inclined roof baille at a level above the lower group of water tubes and extending between water tubes and from their lower v end portions 'for part of their length, and

a transverse baille extending from the inner portion of said roof baille forwardly and upconnected at their ends to water compartments, a steam and water drum above the bank connected to the end compartments,- a lower group of inclined tubes containing a plurality of rows .spaced apart from the main bank to form a chamber therebetween at their upper end portions of a height equal to a plurality of rows of tubes, `la furnace having a combustion chamber extending substantially the entire length ofthe lower exposed rows of tubes, said furnace being of a type which causes slag particles torise toward the water tubes, a horizontally inclined roof 4baffle located in the chamber between the groups of inclined tubes and extending from the lower end portionsv of the water tubes for part of their length, and a transverse baiHe extending from the inner portion of said roof baille forwardly and upwardly at an inclination to the vertical and at an inclination .to lthe water compartment facing the same to form a narrowing pass for the rising gases among the upper portions of the water tubes above the chamber, the boiler having a down pass for the gases at the opposite side of said in'- clined transverse baille.l

6. A boiler of the water tube type comprising a bank of horizontally inclined tubes connected at their ends to water compartments, a steam and water drumabove the` bank connected to the end compartments,y

a lower group of inclined water tubes containing a plurality of rows spaced. apart from the main bank to form a chamber therebetween at their upper end portions of a height equal to a plurality of rows of tubes, a furnace having a combustion chamber extending substantlally the entire length of the lower exposed rows of water tubes, said furnace being of a type which causes slag particles to rise toward the water tubes, a horizontally inclined roof baffle at a level above .the lower group of water tubes andv extending from their lower end portions for part of their length, and a transverse balile extending from the inner portion of the roof baille upwardly across water tubes of the upper bank, the upper portions of said cross baiile being nearer the upper ends of such water tubes than are its lower por tions to give a narrowing pass for therisl to keep more closely 1n contact therewith.

Dawn s. JAooBUs. 

